My sig truck has all the listed mods and at this point i don't know what my best course of action is. I don't tow heavy very often, this truck is my dd, but i want to do as much as i can and it still be streetable and reliable. So my question is, would my next best step be, bigger nozzles, valve springs, head studs, camshaft, or just start saving for twins? Also, i would like to look into building my own plumbing for a compound setup, does anyone know where i can get a schematic to go off of or is it something that you just have to figure out as you go? any advice is appreciated. Thanks, Jay